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71M6534 Datasheet(PDF) 101 Page - Maxim Integrated Products

Part No. 71M6534
Description  Exceeds IEC 62053/ANSI C12.20 Standards
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

71M6534 Datasheet(HTML) 101 Page - Maxim Integrated Products

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FDS_6533_6534_004
71M6533/G/H and 71M6534/H Data Sheet
Rev 2
101
WSUM_X and VARSUM_X are the signed sum of Phase-A, Phase-B and Phase-C Wh or VARh values
according to the metering equation specified in the I/O RAM register EQU[2:0]. WxSUM_X is the Wh value
accumulated for phase x in the last accumulation interval and can be computed based on the specified
LSB value.
For example, with VMAX = 600 V and IMAX = 208 A, the LSB for WxSUM_X is 0.1173 µWh.
Instantaneous Energy Measurement Variables
Table 61 contains various measurement variables. IxSQSUM_X and VxSQSUM are the squared current and
voltage samples acquired during the last accumulation interval. They can be used to calculate RMS voltages
and currents. INSQSUM_X can be used for computing the neutral current.
Table 61: CE Energy Measurement Variables
CE
Address
Name
Description
0x8F
I0SQSUM_X
The sum of squared current samples from each element.
LSBI = 9.4045*10-13 IMAX2 / In_82 A2h
0x90
I1SQSUM_X
0x91
I2SQSUM_X
0x92
INSQSUM_X
The sum of squared current samples from the calculated neutral:
+
+
2
2
1
0
)
(
I
I
I
LSB=9.4045*10-13 IMAX2 / In_82 A2h
0x99
I0SQRES_X
Residual current measurements with double-precision accuracy. The
exact current is:
ISQn = InSQSUM_X + InSQRES_X
0x9A
I1SQRES_X
0x9B
I2SQRES_X
0x9C
INSQRES_X
0x93
V0SQSUM_X
The sum of squared voltage samples from each element.
LSBV= 9.4045*10-13 VMAX2 V2h
0x94
V1SQSUM_X
0x95
V2SQSUM_X
The RMS values can be computed by the MPU from the squared current and voltage samples as follows:
Other Transfer variables include those available for frequency and phase measurement, and those reflecting
the count of the zero-crossings of the mains voltage and the battery voltage. These transfer variables are
listed in Table 62.
MAINEDGE_X reflects the number of half-cycles accounted for in the last accumulated interval for the AC
signal of the phase specified in the FREQSEL1 and FREQSEL0 registers. MAINEDGE_X is useful for
implementing a real-time clock based on the input AC signal.
ACC
S
I
RMS
N
F
LSB
IxSQSUM
Ix
=
3600
ACC
S
V
RMS
N
F
LSB
VxSQSUM
Vx
=
3600


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